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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4046de1d7e4d385c58c584c72ace5e147c93cc1daabe5e8f812de33f62628d11' 
  AND token = 'uQ9dHSV+gGkX2uHLZ+yIAoRZTqSXANdM11aWeY+J97E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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