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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a497eb285e3dd10e875617b280a7ca2f35652ada54b309ba6f88d58cc9216c8' 
  AND token = 'X1rp7ZylNVhiidFOwx1dpiLW4NVoOTg8Zv7RzLtKk88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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