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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e548b02680267e95c09fd4ebc15d918f1f8e059e1282499de8fb11623c4816c7' 
  AND token = 'STF//j74656Vgcjcy3igKT1WZ/g+rI601qVjXcicymI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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