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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b503fc3bdcab20138056fbabc5d5ecb2d0336c8e751f61074720e8c7df54ca' 
  AND token = 'vaxq1IbhXOIfLT0SQ3aNtdoesU8f79WNw7OqPtzBeTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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