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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fd3f1bb9929b99f12c9d2560c8b14405c785ce4321c43764f2dfced442172a' 
  AND token = 'rDp+YEr0pgBHbAxX9l3m14LzlMC5hqJV3HWdkHd22A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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