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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c293b6ac55ea874d0c1acd88fbf40408007f35ad9b0fc9757d0c4e7e4ccd4c93' 
  AND token = '61yVQeRB6NBU8VnVDlz7kTCWBjqMbdbn3fblr3OAGgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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