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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869b378a8d09b029b27796d05aa633ae0d315f95dd11319c227cd51c3668bb56' 
  AND token = '0S5cxVenEiBA5wzqrS4+W3IzrfYneCvtDEePZjIl7No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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