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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b185bf6f7a9e183df5f9116f24bde94ae1829f8544ffcb8e347745adbfdfda' 
  AND token = 'Q6ouT4sU4M72hfSAzT5h93QrRIL0LEhiO+w/4yLP24o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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