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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415f351b49c79e909f948c5f8c960f63c2ecf75e93228f1a78479d22154b7ab4' 
  AND token = 'exvVPfWfd4zn8ll8gcwTrpj7k7TL3y9yOEXNBWN0AQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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