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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da4ae52b8d33801c1268419302b64fee959b005d617237e2a796c922c4d1cc5' 
  AND token = 'Ljwabb0B+qM9MPvLRY2YP0nQ+/okHcFOMK21ivqsMWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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