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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6aa98db47a7192007993c773e007788ce1900ae19ec183c65c31dbc73f33b26' 
  AND token = '2/w2m5W5vWg8UDTRnUZDdC1ocD0qtestpUxkkqlkQt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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