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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc89ba76dae8d7d00d0a1aedfbe0f3653c96ba2b51ba67ed7e102f6a4462c1c' 
  AND token = 'MblgGi5QsGyw8r5sONHu5msYgd90Kji5nb5BNgcQBUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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