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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32cc111eb58f3f188207634bc2584e1d638c2cd748a140374e451ced8e106cb' 
  AND token = 'i+d1dKAWt3RK1IZlp79ViJzPOJ5exCuuOsWJaWocF88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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