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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5eb19801c58e51cc680427e364d2e2a5945fb3c863e67642ce6aac173715d01' 
  AND token = 'sUS6po2NtLJlC2NHKgvjHI1Gd7pKPg94lOrZt7XVI00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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