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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd63a19cb0561f566cb849c2bfa67567f76c5f102da34ae9236ec7b55d749cd7' 
  AND token = 'p11Wnt4HIJ72RreW+kgIlx1mFwBHoK0grahB5UEwEeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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