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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cd2c0c95e92b4c1cc6f8bab5b8356b800268ccf363425bccd588e9009d5924' 
  AND token = 'gblT9/VmS17MY0VGTPYcrlCu06Z8xG18sAlJrZEdVdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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