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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3c0042a23bed2f26b18e8b40a8c7cadce0b2e2ab4a21bb8b9a3f37dd79cdaa' 
  AND token = 'r7tlBAKKneS32cqiBIl9NJcSNhIlAg6RuCrKXNreI8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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