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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fa6e96128087cedd08528c5426c6e147e0b848835c92cddf25ef3d93a64edf' 
  AND token = 'Tx9/0PCSnBoD2UaPd6JCPt4Gd24+iEbw6PRzFkUC4jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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