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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06a914b0ed6cefc15cc08c5e71ba1b7429def46273637a579654f5da433cd90' 
  AND token = 'cyjbME2h2EXeiHj/kDODlO21QiMcLLmLzDNDZZEnMyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}