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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa84c5995b14e6014d4f8a35a6d4387c0e5660f18466b5c0d4423d24ea3cd341' 
  AND token = 'HAb5PzhUTGs79eOKgFNnmVEnPwbAX7QOSYEZbdzZeOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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