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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970514804e5e9d0842387b03e82106422dd0d275ebcaf0b052b50efb2ea61d07' 
  AND token = 'ssPxoskX+OukQI8EM/CflLeZT9pmrAI15tBd/SPn1e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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