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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2610578c7d89eb0c5f7ec52511da15fe2499c180a112f49718fd4af34d74d916' 
  AND token = 'wTK2POrchoIx4VyUkFOZ6j/fdzh8H69VZn1aumjvIyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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