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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1609ed6c4fe97594b3c683a31048b196fbee485765071f549525c645afcf50' 
  AND token = 'qytDcLRtNgyyE2RPJW6CCdLto8ekQ7C+uC+51Zdo9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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