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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5734e7331b4db26c9846a3ef888643c601f16257608f606c76b7709c86e974' 
  AND token = 'ZBX+F0E/6YS+G9HnYWNEpaubkmOs2cy//3H5Z/w1X9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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