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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd025a7e64df7cd9ef4d785ad1fb156a0eed44a76e3634a40237b1aeda3738b80' 
  AND token = 'c3PENwgS6cVRtVHYK8HKc88xNI4k5Zhaqy5GPs9I3OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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