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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae130829edba11a4340632f38ff2f07f950ddcebdf9ac2e2f32c7554917c3d6d' 
  AND token = '1hsQwp/QVHkhQ6v7L+mcsOn99uWE3rx2y5WHDsSH7WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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