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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3090efbf3f08db356c579ec5843e78cb9da8068a3fb37de27dee37033f15fc27' 
  AND token = 'r/LUpINCmmP3L44V3QsHsq+SU1JP4Ljb0OuAHRqTyjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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