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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b7c474f073ad45cd800e7a35f6c7da0e271594514d17e90687f6161a17c101' 
  AND token = 'hhRB7VvJe0T5krugdIIWoyRcPKqNvRK1/DZBXJ3zk+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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