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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09db8b71545b02754cc6c3cf79f55f2291d87538cd9a8b2b2de7c79db39f273a' 
  AND token = 'Ss46+HjlqbeN4gmYzDoyJi9/Z75uAP43gb8W+HCI+Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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