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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb7ef8876c3bae5c87ff0ab685f823ef58afd333f186c03b34089674899f3cf' 
  AND token = '9z04+HouZkTE8Jlp25nTg3QcVNN3JUYi9j4PwPpM2bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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