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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad5eacabc7dc44fab9de0ca864d9f8d17c10804a36e71964acd5b42ae911182' 
  AND token = 'X4vRufTLOCvFbK8QKPmFGC16AYIy9sokFTa44YWSEgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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