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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4d7070f768a64045b26770aee400d994f9f45dc508077d868f8651ae11038d' 
  AND token = '8eVjcYNsomzxbGqjZ3uhJzZk1NEneZjs2aMnslYS1x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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