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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0652fd029cd4112bc6ce31a1239ddd3e65552b9dec3e80d3ddd7b3e51aef26' 
  AND token = 'Hum7u48XZvcIeOJbZGgKVTd9vMPBY2aaspjJBFnoE/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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