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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d89b583dea8948e968b6ec65c562af167d2d67daa797344b196b8f2e27bfaac' 
  AND token = 'jACld4/fQ+ZojyhDqZ0J7H/aAwaFq+4kG+1LNlbo/L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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