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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1695cc895778ed32d1d53f1c09d2b8ca7c48402729d554f56029a9fda3a106' 
  AND token = 'D7bSZTkvwOiBW23xZTSoXPcQxNCbzbIFbT7e9HRgl9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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