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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a155253e32fa388eda2f8dfbb3ecdd1c24b2461b4360782c38a7abe9ab35ea2' 
  AND token = 'o/483qrrYk59670AiSKd8T6FF/S+3IxPMs20arV2K6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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