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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28708e52e1adb75999c815ccb105630b4f81698944db99a45a3e3f20ab497423' 
  AND token = '/vMejtVCP4C1lDFuO6PN41yblUDbiowq39T0ugKU0KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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