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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d29b0561043c062801ac657c914472bd1d79134aa0a6a5977bed26aac67cf8' 
  AND token = 'f5PMUOdnosM83Tfd7t/bMNAhylThOSEl9Y3L3eqc+Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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