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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9660cda504c7b8b0203195dd432463013b378cf071b2325fc6c91b05c419dc7f' 
  AND token = 'NPW3IRkc3UksbKa+H0cMty5WzmjifdZAqj3p5EYbGaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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