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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caba850ee81ce93e57545c47ec51429904d05ba48a32d417a499df28928f0e6d' 
  AND token = 'CE7ODROIS8ZZtXSkRYLq6f4x0s9pIKec/edwa4XLYrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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