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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87f622fb96ec0bf31dfa1832f3b324ca1b04952f8d50a65e0a95f734534831' 
  AND token = '4oiW9T8AKTUkx4zwwA1k6o5vhTqwUjnnegzejUzueYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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