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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ffde9d96248d80de14e5219b44f1c1ecf7def3785010498daa18b7c2bdb93d' 
  AND token = 'gu69PB5qGYJFFwkkS9GPMXISk2HF+NTO7Z4JNWLG6AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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