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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5009476b3b2b98cca7bc6bdedf4c905e48fb7a31e7002fec3cd4aef4b737db' 
  AND token = 'bD8Dd+SEvqMLR72UwsPdJIlwHvIGyh20+eVTVGaCOBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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