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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c77e6d92fa647dddd44c2a21ba61eacf5b25e9bbb7d6a3bc21ed550fa52abba' 
  AND token = 'ZVJjRZSO27FpmwgtVF24JTVWS+iNDiqn7eQ8af2Q7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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