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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ceab2c4a8f9474d2256303e33dc923f5233a30d7cbe2173816ec6b8d248232' 
  AND token = 'azsn8duyQbUzDZ1qbG1424J3lMBYisdVQRstWqXYerg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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