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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b9aebc00d5385d9ef6d3416d225a0aa68fc801e0083746bfde88dbc2d255d' 
  AND token = 'FFXVgNJxFdAFDph4XWryHk6kd4otFFHWgl/KfZjyj3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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