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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbe69643d173b8c564a9ea6de534970a308de09aae0a8b71c8fc0379902180e' 
  AND token = 'gAaUD8xaHuaOojHCgqzsM/5X+It63DnusEmm0lq3aGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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