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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c829c1f406cbaa690df142532b469804e1f7facc6924bb2cda33121be38852' 
  AND token = 'pck3wE4eXeLnk2UlkDfLgmEbyTnp9KXMMqLednraUY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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