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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15330c3cf684e2d4cfe92b48c007d5321a5163aceeb96c993564e3b3d62e61b1' 
  AND token = 'g3QNSWoFQcYSTi0NnoC3FdjWe0loLrRkRSyFpiS6j6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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