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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad92b8d92f154c62d6f31fe47d48bf584d1e6405427d7b323963b1b3e4a90b83' 
  AND token = '5Dzs2MtKZZy3OZTkqMQ16Es6u8pmO/fcO3T2C5Kncd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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