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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fda19e5323a8e3f1c0220b4645b22ed37530c7011926c57c4432b414c43f14' 
  AND token = '4x8R4T9I+rS+CqyU3E9+YKACmnO5/Wh1nOTLSkic9mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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