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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f313b8671f03c87735dc42e15024bb2aaf4176a6dd73b8832382eaeefcd0c0a' 
  AND token = 'bYKU3QfBJO9pxb8llexH1POV+8PcXYsJ3perCpK3A90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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