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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc35f1c118aafd7ce93b1116265324c58c88ba8304529a76e4fff7ac6b8f930a' 
  AND token = 'xa9SkQSgfQL387Mkh+BIDpWf4CY6rczdcfJ3gDaCJLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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