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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8519a658a78f8d4837a4d65e36ec9dce47a2c17d6d847cb0bf37e47ec0b63b' 
  AND token = 'ce5ZzKvmCRaEQSkLeP9bfJxWhwKnLM1/dXaqTYoSG6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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